*{
    margin:0;
    padding: 0;
}
li{
    list-style: none;
}
.logo {
    margin: 30px auto 20px;
    text-align: center;
}
.nav {
    width: 600px;
    height: 40px; 
    margin: 0 auto;
    text-align: center;
}
.navv {
    float: left;
    width: 520px;
    height: 40px;
    background-color: #9fe0ff;
    border: none;
}
.btn {
  float: left;
  width: 70px;
  height: 40px;
  background-color: #0080ff;
  border-radius: 2px;
}
.wenzhi {
     width: 600px;
     height: 40px;   
     margin: 0 auto;
   
}
.wenzhi a {
    width: 20px;
    height: 40px;
    text-decoration: none;
    padding-right: 20px;
    color: #b9b9b9;
}
.xianshi{
    width:1170px;
    height:300px;
    /* background-color: hotpink; */
    margin-left: 500px;
    margin-top: 40px;
}
.xianshi li{
    float: left;
    width: 200px;
    height: 200px;
    /* background-color: lawngreen; */
    margin-right: 15px;
  
    
}
.xianshi li h3{
    text-align: center;
    font-size: 30px;
    color: lightsalmon;
    margin-bottom: 15px;
}
.xianshi li h4{
    text-align: center;
    font-size: 15px;
    color: #ff8040;
    margin-bottom: 15px;
}
.xianshi li h5{
    text-align: center;
    font-size: 13px;
    color: rgb(141, 149, 156);
}